Hussar
Legend
Marking might have different effects (use this with caution; constantly nerfing defenders is bad, m'kay?) - some far realm creatures react differently than others to perceived threats. One might respect the first to mark it, and pursue only that character for the rest of the combat, because it has been challenged and must answer. If it kills that character, it might leave, feeling it's done with the fight - anything that didn't mark it is not a true enemy. Another might not notice the mark at all. Creatures might choose targets based on height, race, gender, charisma, metal content, or who is carrying the light source.
Ooo, I like this one. A spice best used sparingly, but, still really, really cool.
And, different marks might affect the creatures differently too. A Starlock's curse should have a different reaction from a Paladin's challenge.